I have been trying to use ddrescue to make a good copy of a DVD that only works in some of my DVD players. I actually got it to work with one DVD, but the other one gets so far and then, after several hours, the screen looks like this:
***
I have been trying to use ddrescue to make a good copy of a DVD that only works in some of my DVD players. I actually got it to work with one DVD, but the other one gets so far and then, after several hours, the screen looks like this:
***
# ddrescue -v -b 2048 -r 4 /dev/sr0 D1.iso D1.log
GNU ddrescue 1.23
About to copy 7255 MBytes from '/dev/sr0' to 'D1.iso'
Starting positions: infile = 0 B, outfile = 0 B
Copy block size: 32 sectors Initial skip size: 64 sectors
Sector size: 2048 Bytes
Press Ctrl-C to interrupt
ipos: 4415 MB, non-trimmed: 360116 kB, current rate: 0 B/s
opos: 4415 MB, non-scraped: 0 B, average rate: 79775 B/s non-tried: 1716 MB, bad-sector: 0 B,
error rate: 8192 B/s
rescued: 5179 MB, bad areas: 0, run time: 18h 2m pct rescued: 71.37%, read errors: 5569, remaining time: n/a
time since last successful read: 16h 30m 43s Copying non-tried blocks... Pass 5 (forwards)
***
Note that the last successful read time is over 16 hours. At this point, the numbers in the left column have long since quit incrementing, while the numbers (that are not 0) in the other two colums
are the only ones going up.
I have searched on the internet about this. Some folks talk about theirs going days without ever stopping on its own. Others point out that sometimes you can CTRL-C out and the iso you get will be mostly OK. Mine unfortunately was not. :)
Is there anything I should think about changing on the command line to get better results?
* SLMR 2.1a * I am Popeye of Borg. Prepare to be askimilgrated.
so what is the DVD of? is it something like family movies, or is it something u can download.
if you can just download it off the internet, i recommend that.
is that if 30% of the image is unreadable after the first run you know you can
ut the DVD into the trash and need waste no
more time :-)
Arelor wrote to Dumas Walker <=-no
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Re: ddrescue
By: Dumas Walker to ALL on
Mon Feb 08 2021 03:45 pm
I have been trying to use ddrescue to make a good copy of a DVD that only works in some of my DVD players. I actually got it to work with one DVD, but the other one gets so far and then, after several hours, the screen looks like this:
***
# ddrescue -v -b 2048 -r 4 /dev/sr0 D1.iso D1.log
GNU ddrescue 1.23
About to copy 7255 MBytes from '/dev/sr0' to 'D1.iso'
Starting positions: infile = 0 B, outfile = 0 B
Copy block size: 32 sectors Initial skip size: 64 sectors
Sector size: 2048 Bytes
Press Ctrl-C to interrupt
ipos: 4415 MB, non-trimmed: 360116 kB, current rate: 0 B/s
opos: 4415 MB, non-scraped: 0 B, average rate: 79775 B/s
n-tried: 1716 MB, bad-sector: 0 B,Co
error rate: 8192 B/s
rescued: 5179 MB, bad areas: 0, run time: 18h 2m pct rescued: 71.37%, read errors: 5569, remaining time: n/a
time since last successful read: 16h 30m 43s
pying non-tried blocks... Pass 5 (forwards)n
***
Note that the last successful read time is over 16 hours. At this point, the numbers in the left column have long since quit incrementing, while the
umbers (that are not 0) in the other two columsunf
are the only ones going up.
I have searched on the internet about this. Some folks talk about theirs going days without ever stopping on its own. Others point out that sometimes you can CTRL-C out and the iso you get will be mostly OK. Mine
ortunately was not. :)be
Is there anything I should think about changing on the command line to get
tter results?
* SLMR 2.1a * I am Popeye of Borg. Prepare to be askimilgrated.
I don't do a lot of optical media rescuing with ddrescue, but the idea
is that you have to perform the reads using multiple devices.
Say you have a bunch of defective sectors. Some optical media reader is
capable of reading 33% of them. Another media reader can read 50% of them. And another media reader can read 39% of them. Hopefully if you
run ddrescue with each reader, and put the results together, you can rebuild the whole iso or at least the most of it.
You could run a round of reads using the -n switch, which should speed things up quite a bit. Reduce the number of retries too - there is no point in trying 4 times for the sector in a first run. You will
retrieve less data with each pass, but the thing is that if 30% of the image is unreadable after the first run you know you can put the DVD
into the trash and need waste no more time :-)
so what is the DVD of? is it something like family movies, or is it something u can download.
if you can just download it off the internet, i recommend that.
I might be able to download it, I have not looked. People talk about downloading things but I am not sure where they find them. It is a DVD I bought.
I need to get smarter about those things. :)
I have been trying to use ddrescue to make a good copy of a DVD that only works in some of my DVD players. I actually got it to work with one DVD, but the other one gets so far and then, after several hours, the screen looks like this:
I have been trying to use ddrescue to make a good copy of a DVD that onlyIf the DVD is scratched and thats why it's having trouble, you might be able t
works in some of my DVD players. I actually got it to work with one DVD, but the other one gets so far and then, after several hours, the screen looks like this:
get better results trying to address the physical damage. I've been using some
lastic polish that I got off amazon for other things. It works well.
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